Electric heater



Nov. 27 1923 1,475,162

C. C. ABBOTT ELECTRIC HEATER Filed March 5 1921 Invnto'r- I I Charles C. Abbott,

Patented Nov. 27, 19 23.

UNITED STATES PATENT OFFICE.

'GHARLES C. ABBOTT, OF PITTSFIELD, KASSAGHUSETTS, ASSIGNOR EEO-GENERAL ELEC- TRIO COMPANY, A CORPORATION OFNEW YORK.

. nnnc'rmc HEATER.

Application filed larch 5,1921. Serial no. 449,730.

To all whom it may concern..-

Be it known that I, Cmnms C. Anno'r'r, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Electric Heaters, of which the following is a specification.

My invention relates to electric heaters and has for its object the provision of an improved device of this character in which provision is made for greatly increasing the heat radiating surface of the heater. More specifically my invention relates to electric heaters of the type known as v air heaters or space heaters. In carrying out my invention I preferably employ a heating unit of the elongated tubular type having the resistance conductor which forms the heating element, located within the tube. In one embodiment of my invention I utilize the heating unit forming the subject matter of my Letters Patent No. 1,367,341, dated February 1, 1921. This unit comprises a metallic tube having a helical resistance conductor fixed centrally thereof by powdered heat refractory insulating material which is compacted firmly about the helix, so that the heat from the resistance conductor is readily conducted to the tube. Upon this unit I locate heat radiating members which may be in the form of metallic washers which are 'mounted in spaced relation upon the tube and in good heat conductive relation therewith. The heat generated within the tube is therefore distributed through a large radiating surface and a very effective air or space heater is produced.

In the accompan ing drawing-illustrating one embodiment o my invention, Fig; 1 is a sideview of my improved heating unit mounted upon a suitable stand; Fig. 2 is a fragmentary View thereof in ion; and Fig. 3 shows my improved heater bent into a U shape.

to at her dense mass. As m the insulating material.

above mentioned patent, one method of compactlng this material is by drawing or swaging down the tube or sheath after the unit is part of my present invention and a further .descrlptlon of the process of making the same is, therefore, unnecessary, except to say that the heat is conducted from the resistance conductor to the sheath or tube in a very effective manner.

Referring to Fig. 1, 'twill be seen that I have provided the tube 10 with a plurality of heat radiating members in, the form of metallic washers 13 which are strung along the tube at suitable distances apart. These washers are secured in position by any suitable means. One method which is very effective is to swage them on to the tube. This may be done by using dies which very nearly fit the outside diameter of the, washer. By this means the washer is compressed tightly onto the tube 10 so as to be in good thermal relation with the tube. The washers are also thereby held firmly against displace-- ment. The particular form of terminals 14,

.as shown in connection with my improved unit, forms no part of my present invention. a In Fig. 3 I have shown how the heater may be employed in a different manner and for plilirposes of illustration have shown it U s a lii will' be seen that I have provided a very effective space heater in which the resistance conductor is thoroughly insulated and protected from mechanical injury, the arrangement being such that the heater as a whole is practically indestructible. By properly proportioning the radiating surfaces a', very effective space heater may be obtain d.

Whi e I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto, since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims. a

What I claim as new and desire to secure by Letters Patent of the'United States, is,,' 1. An electric heater comprising a metallic tube having mounted thereon a plurality of heat radiating members spaced apart and compressed in heat conductive relation with the tube and a resistance conductor located centrally of the tube and separated therefrom by a thin layer of insulation so that the heat will be readily conducted to the tube and heat radiating members.

2. An electric heater comprising a metallic tube having mounted thereon a plurality of spaced metallic Washers forming heat radiating surfaces compressed into intimate thermal relation therewith, and a resistance conductor located centrally of said tube andinsulated therefrom by compacted powdered insulating material so that the heatwill be readily conducted to the tube and heat radiating members.

3. An electric heater comprising a metallic tube having mounted thereon a plurality of spaced metallic washers forming heat radiating surfaces compressed into intimate thermal relation therewith, and a helical resistance conductor located centrally of saiditube and surrounded by closely compacted powdered insulating material.

4. An electric heater comprisin a cylindrical heating unit composed 0 an outer metallic tube and an inner heating element, and metallic heat radiating Washers swaged over the tube in spaced relation.

5. An electric heater comprising a swaged electric heating unit, and a plurality of heat radiating members arranged in spaced relation on said unit and compressed tightly thereon by swaging.

In Witness whereof, I have hereunto set my hand this 2nd day of March, 1921.

CHARLES C. ABBOTT. 

